Sejong Chemical Co., Ltd. is a company specializing in electronic and optical materials, established in 1999. It develops and produces display and secondary battery materials, natural preservatives, and more through recycling technology and new synthesis. It is headquartered in Cheongju, Chungcheongbuk-do, and is led by CEO Geun-se Yuk.

"Sejong Chemical is a company that develops and produces materials necessary for the electronic and optical materials industry through recycling technology and new synthesis. Since its establishment in 1999, it has been producing and supplying functional chemical substances from electronic and optical material industrial processes, separating and refining them for recycling. Furthermore, for essential functional substances, we contribute to the development of the electronic and optical materials industry by developing them through synthesis. As a specialized company in the electronic and optical materials industry, we aim to develop and provide raw materials that customers need based on accumulated technology and experience, and to become a company that achieves sustainable growth together with the local community."

Business Areas

• Resource Recycling Business: This business involves recovering waste chemicals generated in semiconductor and electronic/optical production processes using unique technology and regenerating them into high-purity products. This reduces environmental pollution and increases resource recycling rates. In particular, we possess the technology to refine and recover potassium iodide (KI) from polarizing film waste liquid.
• New Material Development Business: For functional materials that are difficult to recycle, we develop new economic synthesis methods through research and development. We contribute to the development of the advanced materials industry by developing antistatic agents and adhesives for displays, ionic liquid additives, and natural preservatives for cosmetics.

Products

• Display Materials: We produce KI dyeing solution for polarizing films and antistatic agents (Tri-n-butylmethylammonium bis(trifluoromethanesulfonyl)imide, Lithium bis(trifluoromethanesulfon)imide), among others. These products possess high-purity characteristics suitable for display and semiconductor applications.
• Secondary Battery Materials: We provide various ionic liquid electrolytes, including LiFSI (Lithium bis(fluorosulfonyl)imide), an electrolyte for lithium-ion secondary batteries. They feature high conductivity, solubility, and thermal stability, and can be supplied in dry and liquid forms.
• Natural Preservatives: We develop and produce odorless 1,2-Hexanediol and natural preservatives containing it. We provide eco-friendly preservative solutions applicable to various products such as cosmetics.

Special Notes

• Eco-friendly resource recycling technology: We possess proprietary technology for producing high-purity chemical materials through waste liquid recycling. This contributes to minimizing environmental pollution and maximizing resource efficiency.
• Advanced material development capabilities: Based on our proprietary ionic liquid technology, we develop and produce high-value-added advanced materials such as high-safety electrolytes for secondary batteries and functional adhesives for displays. We are expanding our technology portfolio through continuous R&D investment.
• Stable supply chain and quality: Based on accumulated technology and experience, we stably develop and provide raw materials that our customers need. We contribute to our customers' stable growth through high-quality products and proud organizational capabilities.

Recruitment Information

• Main Hiring Positions: We primarily recruit for chemical product research and development roles.
• Benefits: We operate welfare benefit systems such as housing stability support (provision of apartment dormitories near the company), leisure/cultural life support, tuition support, education support, social security (4 major insurances), and company life support (encouragement of club activities).

💡 A Word from JobPloy
In the chemical product manufacturing sector, precise process management and adherence to safety regulations are extremely important. Sejong Chemical Co., Ltd. handles advanced chemical materials such as display and secondary battery materials, and natural preservatives, thus requiring specialized knowledge and meticulousness in related fields. Particularly, R&D roles require strong chemical major knowledge and experimental capabilities, while production and quality control roles demand adherence to safety regulations and careful work. Among the welfare benefits provided by the company, dormitory provision can help with housing stability.